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Fix __cscncmp_avx2 in strcmp-avx2.S [BZ#28755]

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(cherry picked from commit f95f2fe02e913cbc3f9e2d102faf40ca13afc073)
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liqingqing_1229 2022-01-28 10:36:41 +08:00 committed by openeuler-sync-bot
parent 605efddc34
commit ca8dc2c744
2 changed files with 45 additions and 1 deletions
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6
glibc.spec
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@ -59,7 +59,7 @@
##############################################################################
Name: glibc
Version: 2.28
Release: 87
Release: 88
Summary: The GNU libc libraries
License: %{all_license}
URL: http://www.gnu.org/software/glibc/
@ -149,6 +149,7 @@ Patch65: CVE-2022-23219-Buffer-overflow-in-sunrpc-clnt_create.patch
Patch66: sunrpc-Test-case-for-clnt_create-unix-buffer-overflo.patch
Patch67: CVE-2022-23218-Buffer-overflow-in-sunrpc-svcunix_cre.patch
Patch68: getcwd-Set-errno-to-ERANGE-for-size-1-CVE-2021-3999.patch
Patch69: x86-Fix-__wcsncmp_avx2-in-strcmp-avx2.S-BZ-28755.patch
Provides: ldconfig rtld(GNU_HASH) bundled(gnulib)
@ -1173,6 +1174,9 @@ fi
%doc hesiod/README.hesiod
%changelog
* Fri Jan 28 2022 Qingqing Li <liqingqing3@huawei.com> - 2.28-88
- Fix __cscncmp_avx2 in strcmp-avx2.S [BZ#28755]
* Tue Jan 25 2022 Qingqing Li <liqingqing3@huawei.com> - 2.28-87
- fix CVE-2021-3999

40
x86-Fix-__wcsncmp_avx2-in-strcmp-avx2.S-BZ-28755.patch Normal file
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@ -0,0 +1,40 @@
From ddf0992cf57a93200e0c782e2a94d0733a5a0b87 Mon Sep 17 00:00:00 2001
From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Sun, 9 Jan 2022 16:02:21 -0600
Subject: [PATCH] x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]
Fixes [BZ# 28755] for wcsncmp by redirecting length >= 2^56 to
__wcscmp_avx2. For x86_64 this covers the entire address range so any
length larger could not possibly be used to bound `s1` or `s2`.
test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass.
Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
---
sysdeps/x86_64/multiarch/strcmp-avx2.S | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
index a45f9d2..9c73b58 100644
--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
@@ -87,6 +87,16 @@ ENTRY (STRCMP)
je L(char0)
jb L(zero)
# ifdef USE_AS_WCSCMP
+# ifndef __ILP32__
+ movq %rdx, %rcx
+ /* Check if length could overflow when multiplied by
+ sizeof(wchar_t). Checking top 8 bits will cover all potential
+ overflow cases as well as redirect cases where its impossible to
+ length to bound a valid memory region. In these cases just use
+ 'wcscmp'. */
+ shrq $56, %rcx
+ jnz __wcscmp_avx2
+# endif
/* Convert units: from wide to byte char. */
shl $2, %RDX_LP
# endif
--
1.8.3.1